| 摘要 |
PURPOSE:To stabilize the operation of a feedback loop by providing the loop corresponding to an instruction signal and increasing the degree of freedom of setting the angular frequency so that the loop gain becomes 1, thereby compensating for the phase of the energizing state to polyphase coils. CONSTITUTION:A DC motor which has a field magnet 11 and 3-phase cols 12- 14 is controlled by an instruction signal generator 18 by applying signals from rotor position detecting Hall elements 15-17 to a power distribution supply unit 101. In this case, a feedback loop which has the unit 101, a current detector 102, a comparator 103 and a phase compensation condenser 100 is provided, a comparator 103 is connected to the collector side circuit of the transistor 25, and the first output of a constant current supply unit 104 is connected to the second output of a base side circuit. Accordingly, the setting range of the angular frequency so that the loop gain becomes 1 can be increased, thereby stably operating the loop even if the supplied states to the respective phase coils are varied. |
